Lapping machine



Nov. 8, 1932. o. R. RELLER ET AL I 1,886,336

LAPPING MACHINE 2 Sheets-Sheet 1 Filed March 31, 1932 (0%, 7f ggINVENTORS M 620ml 91cm, 914% 71W,

Q WATTORNEY.

Nov. 8, 1932. 0. R. RELLER ET AL 1,886,336

LAPPING MACHINE Filed March 31, 1932 2 Sheets-Sheet 2 H IE E T7 15 k. 01 L 1 J L.

(D INVENTOR. M W $17M BY WJMVZRYMMZ,

W ATTORNEY.

Patented Nov. 8, 1932 UNITED s rr om'ro R. KELLERAn'ncnhnnncnzw.Hamming-0F Momnn, ILLINOIS, ASSIGNQBS r0 oLmnmoon-coPnNY, oF-MoLI'nE; ILLINOIS Ln-reins MACHINE Our inventionhas-referenceito an improvement in lapping machines, and-relates;- morespecially to the lapping tool or hea dj, and means 1 for increasing; theefiiciency thereof.v

It also relates more particularrlyto; the; type of. toolseteforth-inLetters Patentot the; United StatesNo-n1,761,126,;issued toWilson PgH-unt-etoal June 3O; 19 30.: Saidpaitent shows a. structureincluding a cylindrical:

body suppenting, a plurality" of; grinding stones and a centralexpansion elementsof double cone formation-.. Thi s element-is-permitteda limited amount of freedom in-the cylinder, making it'possible to. movein any direction, or float during the operation. of; the tool, enablingthe stones to conform in-v stantly to irregulanities orinequalities: inthe boreof the cylinder orio ther part-that is being honed. Orr accountofthe conesbeirrg of circular formation a shifting of-thegexpansi'onelementin one directionor the other tends to reduce. the spacebetweertthe stone controlling devices at j the, sides; thereof, so thatthere is a failure vof the. stones toiperform their; workproperly, The zchief purpose of; the present invention; is to remedy this defect, andprovide means for lreeping: theistones up to theinwo nkiat all times,

7 The, particular construction; arrangement, and modeof. operation oftheflparts of the invention, will more fully appear from the followingspecification, taken in connection with: the accompanying: drawings, inWhich; v W Fig.1 is a. vertical medialsection of alap ping headembodying the invention; vwith some; partsshovvn in full; lines;

line.

. 'The-figures of the drawings are fragmentany, and limited to thelapping tool or head, it being understood that the parts disclosed aresupported and operated by othermechani sms ina' manner Well known-forsuch in strumentalities. i

I Fig 1 th ar a the lower' part of a tubular supportpcarnyiiig a head 2,containing channels 3","in Which aremovably held shoes 4 for the supportof lappingstones 5. The shoes 4 are encircled at their ends by coiledsprings G and 7, also known inn-the art, vand tending; to holdthe shoesyi el'dably, in the' channels 3'. Near the endsjofsaid shoespins 8 arefinedthereto and ence number 1 indicates projected inwardly throughbearings 9 in the support 1', and into ,engagementat their inner endswith expansion members 1 0 and 11 on-the, ends of a core 12, in the boreof the support 1. Said: expansion members are ofa frust o pyramidformation, in inverted posi.-

tion,,and there is a clearance between the circular heads 1301'? saidmembers and the Walls of said bore, as shownin said' former patent,permittinga limited movement of theeX-pansion element independently ofthe support.

Downward movement ofthe core 12 may be effected by means of a 'rod14projected up- Wardly through the tubal, and-thelower end Qf WlilQlirod'hears against a ball 15 in a bearing in theupper end'ofsaid core. Asa resultoflsuch downward movement the pins 8; and shoes {L- are moved.outwardly coextensively, adapting the stones to the Work in whichthetoolgis operating; I The rodll'd' can he actuated in anylsuit'ab'lemanner, such as that shown in said former patent.

, The expansion members lOiandl l' are rec tangular inncross-s'ection asshown, herein, although variations in theshape thereof may h'ejha'dl ItWilllhe observed that the ends of the are in contact withthefi'a'cesofsaid members, and that' the position Of the 'ex-. pensionmember-.1 canlie shiftedto onesidepri the other withoutichanging therelative posi tionsnoffthe. pins above and belowthe same. For.exampl'ain Fig: 4E, which .is the form in which aconical'eiipandingmember is used, a set :of stones l8 is-shown,.held hyshoes 19, fittedlvvithpai rs of'pins 2O and-2 1, the inner tothedetriment of the work.

. "In said Figure 4 the amount of variation in the parts isexaggerate'dsomewhat, for the purpose of the illustration, but occasionally a veryslight variation, such as the thousandth of an inch will beattended withunsatisfactory results.

' The operation of the parts as carried out in the present invention isindicated in Fig. 5,

in which the expanding element ll'is again shown moved to the left ofthe center line, but with the upper and lower pins in contact with theflat faces of said element, and the spacing of said pins maintained. Theonly variation in this spacing will come about through the change in theposition of. the element 11 longitudinally, with a portion thereof ofdifferent diameter separating the pins.

It will be understood that in the operation of the tool all of the partsrotate in unison, and that as shown in Fig. 5 the pair of stones at thesides, and'those at the top and bottom alternate with each other inposition in quick succession. The same is true of the pins 8,

but Whatever position said pins may be in the spacing of such pins willat all times equal the thickness of the section of the part 11 or part10 which separates them, and gauges the distance between them.

In Fig. 6 is shown the lower end of a tubu lar support 24, in the centerof which is a cylinder-shaped expansion member, 25, also capable of alimited amount of play in the bore of said support. 'In the sides ofsaid expansion member are recesses 26 and 27, to receive the inner endsof sets ofpins 28 and 29, with which are connected shoes 30, carryingstones 31, which shoes and stones are movable in channels 32 and thehead 33. The ends of V the shoes 30 are held for yieldable movementoutwardly by coiled springs 34.. The recesses 26 and 27 are formedwithwalls 35 and 36 inclined upwardly and outwardly, against which theends of the pins 28 and 29 engage, the downward movement of theexpansion element, in a manner similar to that of the part '12,operating to movethe pins outwardly and' increase the circumferenceof'the move ment of the stones. The width of the recesses 25 and 26 issomewhat greater than the thickness of the pins 28 and 29, permittingindependent movement of theexpansion element to one side or the other,similar to'that shown in Fig. 5. One advantage to be found-in iforhoning elements, an expansion element held in said support so as to havea lim- .it-edv clearance therefrom, and provided on its sides with planesurfaces, shoes carried by said. support, connections between said shoesand said expansion element bearing against said planes, and means foractuating said expansion element.

2. Ina lapping machine, a tubular-support for'honing elements, an'expansion element held in said support so as to have a limitedjamountofclearance therefrom and pro- Vided on its sides with oppositely disposedplane surfaces, stone bearing shoes carried by said support, and pairsof radial pins held slidably in said support, connected at their outerends with said shoes and bearing against said plane surfaces attheir-inner ends. a

3. In a lapping machine, a tubular support for honing elements, anexpansion element held in the bore of said support'so as to haveclearance with the walls of said bore, andincluding a pair offrusto-pyramidal members having flat faces in rectangular formation,shoes carried by said support, means for holding said shoes yieldably ininner positions, and pairs of radial pins connecting'said shoes withsaid members and bearing against the flat surfaces thereon. v

,4. In a lapping machine a tubular support for 'honing'elements', anexpansion element held in the bore of said support and having clearancetherefrom, and of double wedge formation, stone-carrying shoes carriedby said support, pairs of radial pins slidable in said support,connected with said stone-carrying shoes at their outer ends and incontact at thelr lIlIlvZ-zfends 'wlth said exlCI pansion element, andmeans for adjustment of the position'of said expansion element to Ispread said shoes, the lateral shifting of said expansion element beingpossible without disturbing the relative positions of the pins bearingagainst the sides thereof. 5. In a lapping machine a tubular support, acylinder-shaped expansion element in the bore of said' support havingclearance from the walls of said bore, and provided with sets ofrecesses with inner cam faces, stoneholding shoes carried by'sa-idsupport, and radial pins held slidably in said support, fixed at theirouter ends, to said shoes and projected into said recesses at theirinner ends. i

6. In a lapping machine, a tubular'support, a cylinder-shaped expansionelement in the bore of said support having clearance from the Walls ofsaid bore, and provided with sets of recesses with inner cam faces,stone-holding shoes carried by said support, and radial pins heldslidably in said support, fixed at their outer ends to said shoes andprojected at their inner ends into said recesses, said pins having alimited lateral play in the recesses.

In testimony whereof, I aflix my signature.

OTTO R. RELLER. CLARENCE W. HALLENE.

